Abstract
The ball-milled Fe-Si alloy was used as feedstock for deposition of nanocrystalline Fe-Si by cold spraying process. The microstructure of the as-sprayed nanostructured Fe-Si was characterized by using optical microscopy, scanning electron microscopy and transmission electron microscopy. The grain sizes of the feedstock and as-sprayed deposit were estimated based on X-ray diffraction analysis. The microhardness and coercivity of the deposited Fe-Si alloy were characterized. The results showed that the as-sprayed deposit presented a dense microstructure. The mean grain size of the as-deposited Fe-Si was several tens nanometers and comparable to that of the corresponding milled feedstock. The temperature of driving gas presented little effect on the microstructure of cold-sprayed nanostructured Fe-Si deposit. The mechanical alloying induced oxygen contents up to 8 wt% in the feedstocks and subsequent deposits. The microhardness of the deposit reached about 400 Hv. The deposit achieved a high coercivity up to 190 kA/m indicating the potential possibility for applications to recording materials.
| Original language | English |
|---|---|
| Pages (from-to) | 2193-2198 |
| Number of pages | 6 |
| Journal | Applied Surface Science |
| Volume | 256 |
| Issue number | 7 |
| DOIs | |
| State | Published - 15 Jan 2010 |
Keywords
- Coercivity
- Cold spraying
- Fe-Si coating
- Mechanical milling
- Microhardness
- Nanostructure